An anonymous reader writes: I was Ironically foiled by the very subject matter of this article by Slashdot's submission form. CAPTCHA puzzles are a necessary evil to prevent us all from an inbox full of viagra. However, they're inconvenient, inaccessible (for visually impaired users) and machines are getting better at solving them too. How can CAPTCHA puzzles be made more relevant, user-friendly and future-proof? Will they even matter any more in the future? I'm an Undergrad Artificial Intelligence Student and these are my thoughts.